Muffling device



April 27, 1937.

WITNESSES E. E. GROVER MUFFLING DEVICE Filed Nov. 27; 1934 FlCz.1.

2 Sheets-Sheet l E LLIOTTE.G:ROVER.

INVENTOR ATTOR Patented Apr. 27, 1937 UNITED STATES PTENT OFFICE MUFFLING DEVICE Elliott E. Grover, Springfield, Mass, assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania Application November 27, 1934, Serial No. 754,967

2 Claims. (01. 18135) My invention relates to muffling devices and to the interior of one of the corrugations iii. The

a method of manufacturing such devices, for discs 24 are provided with apertures 26 to reuse particularly with gas compressors. strict the passage of gas through the muffiing It is an object of my invention to provide a chambers 2|, 22, and 23, the apertures 26 being 5 unitary muffler construction which is easily asaxially offset to direct gases passing through sembled and inexpensively formed. the muilling chambers 2|, 22, and 23 in a tor- It is another object of my invention to provide tuous path, whereby the mufiling devices effecan effective mufiiing device for the compressor tively deaden the sound of gas passing thereof mechanical refrigerating apparatus. through. As shown in Figs. 5 and 6, the discs These and other objects are effected by my in- 24 and spacing member 25 are preferably formed 0 vention, as will be apparent from the following from a single stamping bent to the desired 1 description and claims taken in connection with shape.

the accompanying drawings forming a part of Aconnecting passage 21 opens between mufiling this application, in which: chambers 2| and 22. The connecting passage Fig. l is a view of a mechanical refrigerator 2? is formed by depressing complementary por- 15 of the compression type with parts thereof tions 28 in the plates i8 adjacent one end of the broken away to show the compression apparatus; chambers 2! and 22. An inlet passage 29 is pro- Fig. 2 is a plan view of a muflling device convided at the opposite end of the mufiling chamber structed in accordance with my invention; 22 from the connecting passage 21. An outlet 0 Fig. 3 is a sectional view of the muflling device passage 3| is provided at the opposite end of the taken on line III-III of Fig. 2; muffiing chamber 2| from the connecting passage.

Fig. 4 is a side view of the muffler construction A second inlet passage 32 is provided at one end shown in Fig. 2; of the mufliing chamber 23 and a second outlet Fig. 5 is a side view of a baffle member which passage 33 is provided at the opposite end of the t forms a part of the muffling device; and, chamber 23. 5

Fig. 6 is a front view of the baffle member. Apertures are provided in the plates i8 to Referring specifically to the drawings for a dereceive fastening devices for attaching the unitailed description of my invention, a complete tary muffling device to a portion of the commechanical refrigerator I0 is shown in Fig. 1. pression means i2.

The mechanical refrigerator l0 comprises a her- The operation of the mechanical refrigerating 30 metically sealed casing H which encloses a moapparatus embodying my improved muffling detor, (not shown), and a compressor i2. A convice is as follows: vaporized refrigerant which denser H5 is provided for condensing refrigerant has absorbed heat from the evaporator I5 is vapor compressed by the compressor E2; the conwithdrawn from the evaporator by the suction 35 denser being cooled by a fan It. An evaporator of compressor l2 and is conveyed through a con- 35 I5 is supplied with liquid refrigerant through duit 35 to the sealed casing From sealed the intermediary of a float controlled valve I6, casing Ii, vaporized refrigerant is conveyed to which liquid refrigerant is vaporized in the inlet 29 of muffling chamber 22 through a conevaporator l5 and absorbs heat therefrom. A duit 3!]. The vaporized refrigerant is then drawn unitary muiiling device, generally indicated at IT, through muiiling chamber 29, passage 21 and 4,0 is associated with compressor in a manner heremufiling chamber 2| to outlet 3| of chamber 2|. inafter fully described. The gas in passing through chambers 22 and 2|,

Referring p fi y 0 Figs. 2 to 6, the mufiler passes through the bailie members 24, and the construction generally referred to by numeral I! sound of the gas is thereby deadened. The gas is 40 comprises two fiat metal plates l8 each having conveyed through a conduit 36 from outlet 3| sets of three complementary corrugations it of muffiing chamber 2| to the compressor i2. stamped therein. The plates I8 are welded or The gaseous refrigerant thus conveyed to comotherwise fastened together at their meeting pressor I2 is compressed thereby, and is conveyed edges and between corrugations Hi, to form a through a conduit 31 to the inlet 32 of muffling unitary mufiling device embodying three muffiing chamber 23. The compressed gas is then forced 50 chambers 2|, 22 and 23 therein. Before welding through the mufiling chamber 23 to the outlet the plates l9 together, a pair of discs 24 fas- 33 thereof, the sound of the gas being deadened tened together by a spacing member 25 (see Figs. by the baflie members 24 in muffiing chamber 23.

5 and 6) are fastened interiorly of each muffiing The compressed gas is then forced to the conchamber by welding the spacing members 25 to denser [3 through a conduit 38. The gaseous refrigerant is cooled by air forced over the condenser l3 by the fan l4, and is condensed.

Condensed refrigerant is conveyed to the evaporator I5 by a conduit 39, having the float controlled valve I6 interposed therein for regulating the flow of refrigerant liquid to the evaporator, and the cycle is then repeated.

It is desirable to provide two chambers for the passage of gas from the cooling element IE to the compressor l2 because there is little restriction in this part of the system to assist in deadening the sound of the gas passing therethrough. The apertures 26 in the discs 24 disposed in muflling chamber 23 are smaller than those in the discs disposed in muiiling chambers 2| and 22. The gas passing through the muffling chamber 23 being at high pressure occupies less volume per unit of weight, and the high pressure gas must, therefore, be battled to a greater extent by making the apertures 26 small in order to eflfectively deaden the sound of the moving gas.

From the foregoing, it will be apparent that I have provided an effective unitary muflling device which is inexpensively formed. The muffling device is particularly applicable to compression refrigeration apparatus but is not to be limited to such use, as it may be effectively employed with any type of gas compressor. I While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

1. A multiple muilier construction for a gas compressor comprising two flat metal wall members, and a plurality of complementary depressions formed in each wall member, said wall members being juxtaposed and welded around the edges and between the depressions to form a plurality of muilling chambers, one of said muffling chambers being connected to receive the discharge gas from said compressor, and another of said mufiiing chambers being connected to receive the intake gas for said compressor, whereby the entire mass of the metal of said mufiler construction deadens the pulsations of the discharge and intake gas from and to said compressor.

2. A multiple muiller construction for a gas compressor comprising two flat metal wall members, a plurality of complementary depressions formed in each wall member, said wall members being juxtaposed and welded around the edges and between the depressions to form a plurality of mufiling chambers, one of said muiiling chambers being connected to receive the discharge gas from said compressor, and another of said muilling chambers being connected to receive the intake gas for said compressor, and a baffling member for the muflling chambers comprising a single piece of metal bent to substantially U-shape, the bottom of the U being fastened to an internal wall of a muflier chamber, and the legs of the U extending transversely of and conforming with the shape of the mufliing chamber and being provided with apertures therein for the passage of gas, the bottom of the U-shaped baffling member serving as a spacer and as an attachment for legs thereof.

ELLIO'I'I E. GROVER. 

